Color–more than any other element–is what most people complement my work for. I’m happy for that, because together with composition–something most people don’t think about, because it’s subtle–color is something I really focus on. I’ve learned a lot about color from Camille Przwodeck, one of the coutry’s premier colorists. Her work always inspires me, and she’s a great person too (you’d think I work for her, but I swear, I don’t ;-). If you want to improve your color sense, study with her.
Here’s her list of workshops this year (PDF format), and some sample work. See what I mean?